tea_test.rar_tea_tea_test_加密 解密_加密解密_字符串 加密 解密

#include "tea.h" #include <cstring> //for memcpy,memset using namespace std; TEA::TEA(const byte *key, int round /*= 32*/, bool isNetByte /*= false*/) :_round(round) ,_isNetByte(isNetByte) { if (key != 0) memcpy(_key, key, 16); else memset(_key, 0, 16); } TEA::TEA(const TEA &rhs) :_round(rhs._round) ,_isNetByte(rhs._isNetByte) { memcpy(_key, rhs._key, 16); } TEA& TEA::operator=(const TEA &rhs) { if (&rhs != this) { _round = rhs._round; _isNetByte = rhs._isNetByte; memcpy(_key, rhs._key, 16); } return *this; } void TEA::encrypt(const byte *in, byte *out) { encrypt((const ulong*)in, (ulong*)out); } void TEA::decrypt(const byte *in, byte *out) { decrypt((const ulong*)in, (ulong*)out); } void TEA::encrypt(const ulong *in, ulong *out) { ulong *k = (ulong*)_key; register ulong y = ntoh(in[0]); register ulong z = ntoh(in[1]); register ulong a = ntoh(k[0]); register ulong b = ntoh(k[1]); register ulong c = ntoh(k[2]); register ulong d = ntoh(k[3]); register ulong delta = 0x9E3779B9; /* (sqrt(5)-1)/2*2^32 */ register int round = _round; register ulong sum = 0; while (round--) { /* basic cycle start */ sum += delta; y += ((z << 4) + a) ^ (z + sum) ^ ((z >> 5) + b); z += ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d); } /* end cycle */ out[0] = ntoh(y); out[1] = ntoh(z); } void TEA::decrypt(const ulong *in, ulong *out) { ulong *k = (ulong*)_key; register ulong y = ntoh(in[0]); register ulong z = ntoh(in[1]); register ulong a = ntoh(k[0]); register ulong b = ntoh(k[1]); register ulong c = ntoh(k[2]); register ulong d = ntoh(k[3]); register ulong delta = 0x9E3779B9; /* (sqrt(5)-1)/2*2^32 */ register int round = _round; register ulong sum = 0; if (round == 32) sum = 0xC6EF3720; /* delta << 5*/ else if (round == 16) sum = 0xE3779B90; /* delta << 4*/ else sum = delta << static_cast<int>(logbase(2, round)); while (round--) { /* basic cycle start */ z -= ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d); y -= ((z << 4) + a) ^ (z + sum) ^ ((z >> 5) + b); sum -= delta; } /* end cycle */ out[0] = ntoh(y); out[1] = ntoh(z); }